Evaluation of Twinning Behavior in Rolling of Mg Alloys with Three Kinds of Textures by a Generalized Schmid Factor

In this work, we statistically investigate the texture effect on twinning behavior in rolling of an AZ31 Mg alloy by electron backscatter diffraction technique and evaluate it by a generalized Schmid factor (GSF). The results show that twinning nucleation and area fraction are promoted significantly with the c-axis of grains rotating from the transverse direction to the rolling direction. More importantly, twin propensity and the selection of twin variants can be well explained by the GSF that is calculated based on an estimated stress state for rolling. The present results provide some insights into controlling the microstructure and texture of Mg alloys by rolling processes.